The gallon (abbreviation "gal"), with the US and imperial gallon, is a measure of volume. Historically it has had many definitions, but there are three definitions in current use: the imperial gallon (˜ 4.546 L) which since metrication is used colloquially in the United Kingdom and semi-officially within Canada, the United States (liquid) gallon (˜ 3.79 L), and the lesser used US dry gallon (˜ 4.40 L). The gallon, be it the imperial or US gallon, is sometimes found in other English-speaking countries.